336 University of California Publications in Zoology [Vou 24

Buteo borealis calurus Cassin. Western Red-tailed Hawk

Several pairs were breeding near Hazelton and in Kispiox Valley.
Tn the latter locality, not far from our camp, there was an occupied
nest at the top of a tall tree that towered above a surrounding jungle,
too impenetrable to be traversed.

Toward the end of August there was a noticeable increase in the
number of red-tails observed, due probably to an influx of migrants,
and many were seen up to the end of my stay, September 26. There
was wide variation in color; light-breasted birds were seen and some
exceedingly dark ones. One specimen was collected (no. 42048), an
immature male, taken in Kispiox Valley August 27. It is in the dark
phase of plumage, blackish throughout with extensive white streaks
and blotches partly concealed at the bases of the feathers.

Buteo swainsoni Bonaparte. Swainson Hawk

Hawks supposed to be of this species were seen occasionally late
in August and early in September, but only one was shot. This bird
(no. 42049) is an immature male, taken in Kispiox Valley, August 24.
Its stomach contained a toad.

Aquila chrysaétos (Linnaeus). Golden Eagle

Seen at intervals during the summer. at Hazelton, at the base of
the nearby mountain range, Rocher Déboulé, and on Nine-mile Moun-
tain. From July 16 to 20 one was seen daily at Hazelton, haunting the
river banks and evidently feeding on dead salmon. On Nine-mile
Mountain one followed a regular beat almost daily, recognizable as the
same individual through a peculiarity of marking. This bird was
hunting marmots assiduously and swung about the mountain side low
over the ridges, apparently trusting his sudden appearance to enable
him to surprise a marmot at a distance from shelter.

Haliaeétus leucocephalus alascanus C. H. Townsend.
Northern Bald Eagle

Seen in the lowlands at various times during the summer. As the
season advanced, the dead and dying salmon on the river banks were
a bountiful source of food to the eagles, and increasing numbers of
the birds appeared. What seemed to be entire families were seen
several times, in July, groups composed of two adults with two or
three full-grown young.